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http://dx.doi.org/10.3807/JOSK.2015.19.6.619

Deterministic Estimation of Stripe Type Defects and Reconstruction of Mask Pattern in L/S Type Mask Inspection  

Kim, Wooshik (Department of Information and Communication Engineering, Sejong University)
Park, Min-Chul (Sensor System Research Center, Korea Institute of Science and Technology)
Publication Information
Journal of the Optical Society of Korea / v.19, no.6, 2015 , pp. 619-628 More about this Journal
Abstract
In this paper, we consider a method for estimating a stripe-type defect and the reconstruction of a defect-free L/S type mask used in lithography. Comparing diffraction patterns of defected and defect-free masks, we derive equations for the estimation of the location and size of the defect. We construct an analytical model for this problem and derive closed form equations to determine the location and size using phase retrieval problem solving techniques. Consequently, we develop an algorithm that determines a defect-free mask pattern. An example shows the validity of the equations.
Keywords
EUVL (Extreme ultraviolet lithography); Phase retrieval;
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